Hey everyone new to the forums and new to pool ownership so please bare with me. Have owned our new home for the last two months and the pool guy has kept the pool sparkling clean. But over the last couple of weeks I have noticed some yellow mustard algae developing in the pool. I confronted him about it when he was there last wednesday and he said because the temperature has been so hot lately a lot of people have been experiencing this....i know you probably want to know my chlorine levels etc....i am going to buy a test kit this weekend and will get back to you with that but what do you think about what the pool guy told me? thanks for any help in advance and sorry for the long read.